If anyone is interested, I developed a roll of Delta 3200 (rated at around 1600) in Neofin Blau today. I couldn't find development times for this combo, so I chose to develop for 30 minutes (20 C) in standard dilution (one little bottle of developer plus water to make 500 ml) Neofin Blau with agitation every minute.

The negatives turned out to print well on grade 2,5 paper. Yes, there is grain at virtually any magnification, however, with Delta 3200 it's better to make the grain prominent (or natural), than mushy. I didn't make a proper test with multiple developers and EIs, because I rarely use this film, but to my eyes, this combination isn't more grainy than with Microphen or Rodinal, but it is quite a bit sharper.